import CPUTime

fib :: Integer -> Integer
fib n
    | n < 0 = 0
    | n == 0 || n == 1 = 1
    | otherwise = (fib (n - 1)) + (fib (n - 2))

main = do
        start <- getCPUTime
        print (fib 26)
        finish <- getCPUTime
        print ((finish - start) `div` 1000000000)
